Uninitialized scalar variable

The variable will contain an arbitrary value left from earlier computations. Use of an uninitialized variable
/src/mongo/db/exec/sbe/parser/parser.cpp:917: UNINIT 116952 Declaring variable "dropKeepPos" without initializer.
/src/mongo/db/exec/sbe/parser/parser.cpp:952: UNINIT 116952 Using uninitialized value "dropKeepPos" when calling "operator []". [Note: The source code implementation of the function has been overridden by a builtin model.]